Optimizing the electrons/ions diffusion kinetics in δ-MnO2 for realizing an ultra-high rate-capability supercapacitor

Tang, Chaojing; Wang, Xin; Ma, Mingzhu; Wang, Zhongliao; Li, Y. G.; Li, Han; Li, Bing; Zhang, Yongxing; Zhu, Xuebin

doi:10.1016/j.cej.2023.144784

Cited by 25 publications

(1 citation statement)

References 76 publications

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“…Many high-performance supercapacitors have been developed using transition metal compounds with nanostructures [10], such as aluminum oxide [11], niobium oxide [12], iron oxide [13], etc. As a typical representative of pseudocapacitive materials, MnO 2 has attracted great attention as a good candidate for electrode materials owing to its rich sources, low price, and excellent electrochemical performance (theoretical specific capacitance of 1370 F/g) [14,15]. MnO 2 can obtain various forms under different process conditions, and its most common crystal forms are α-MnO 2 , β-MnO 2 , γ-MnO 2 , δ-MnO 2 , and λ-MnO 2 [16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Facile Synthesis of Ag-Doped Urchin-like MnO2 on Carbon Cloth for Supercapacitors

Feng,

Qu,

Wang

et al. 2024

Materials

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Based on MnO2/carbon cloth (CC) composite materials, an Ag-doped MnO2 nanowire, self-assembled, urchin-like structure was synthesized in situ on the surface of CC using a simple method, and a novel and efficient flexible electrode material for supercapacitors was developed. The morphology, structure, elemental distribution, and pore distribution of the material were analyzed using SEM, TEM, XRD, XPS, and BET. The electrochemical performance was tested using cyclic voltammetry (CV) and galvanostatic charge/discharge (GCD). In the three-electrode system, GCD testing showed that the specific capacitance of the material reached 520.8 F/g at 0.5 A/g. After 2000 cycles at a current density of 1 A/g, the capacitance retention rate was 90.6%, demonstrating its enormous potential in the application of supercapacitor electrode materials.

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Section: Introductionmentioning

confidence: 99%

Facile Synthesis of Ag-Doped Urchin-like MnO2 on Carbon Cloth for Supercapacitors

Feng,

Qu,

Wang

et al. 2024

Materials

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Unraveling the Effect of Electric Discharge Machining Current on the Fabrication of 3D Mo‐Doped VO_0.2 Integrated Microsupercapacitors

Chen,

Lv,

et al. 2024

Adv Eng Mater

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Vanadium oxides are widely used for microsupercapacitors (MSCs) due to their multiple‐valence and high theoretical capacitance. A conceptually new approach of electric discharge machining (EDM) with computer‐aided control is developed to one‐step fabricate Mo‐doped VO0.2‐based electrodes and devices with designable geometry. The results demonstrate that the Mo@VO0.2 integrated interdigital MSCs (IIMSCs) with the narrowest electrode distance of 300 μm show the best capacitive performance, which is furtherly manifested by the electric field simulation. Moreover, this work concentrates on expounding the relationships between the EDM machining current, surface morphology of Mo@VO0.2, and the capacitive behavior of Mo@VO0.2 IIMSCs. Compared to the machining current of 2 and 3 A, the machining current of 1 A facilitates synthesizing smaller Mo@VO0.2 particles with more porosity and higher surface area and thus achieving a larger capacitance value for Mo@VO0.2 IIMSCs device, which is achieving 32 mF cm−2 at 1 mV s−1, working well up to an ultrahigh scan rate of 30 V s−1, and obtaining a good cyclic stability of 88.61% after 5000 cycles. Moreover, this innovative EDM approach opens a new avenue for one‐step synthesis of various ceramic metal oxides for various microdevices such as microbatteries and microsensors.

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Carboxymethylcellulose Induced the Formation of Amorphous MnO₂ Nanosheets With Abundant Oxygen Vacancies for Fast Ion Diffusion in Aqueous Zinc‐Ion Batteries

Zhang,

Ma,

et al. 2024

Adv Funct Materials

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Manganese dioxide with high theoretical capacity has drawn a great deal of attention for aqueous zinc‐ion batteries (ZIBs). Nevertheless, their sluggish diffusion kinetics, low electrical conductivity and limited active sites are still hindering the potential application in batteries. Herein, amorphous MnO2 nanosheets with abundant oxygen vacancies are facilely prepared by using carboxymethylcellulose sodium (CMC) as a capping agent. During the growth process, CMC can preferentially attach to the (003) facet of MnO2 to guide its crystal growth and morphology. The small nanosheets can expose abundant edge sites, along with the surface oxygen vacancies, to facilitate the insertion/extraction of H+ and Zn2+ in ZIBs. Moreover, the presence of CMC can stabilize the Mn3+ to inhibit the Jahn–Teller effect in the preparation process. As a result, CMC‐MnO2 based ZIB can provide a specific capacity of 324 mAh g−1 at 0.5 A g−1, and achieve 86.2% retention after a long cycle test of 1000 cycles. Furthermore, the energy storage mechanism may be attributed to the insertion/extraction of H+/Zn2+, dissolution/deposition of MnO2 and Zn4SO4(OH)6·nH2O, and irreversible transformation of vermiculite during long cycles. This work may open new perspectives for the development of MnO2‐based cathodes in ZIBs.

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Optimizing the electrons/ions diffusion kinetics in δ-MnO2 for realizing an ultra-high rate-capability supercapacitor

Cited by 25 publications

References 76 publications

Facile Synthesis of Ag-Doped Urchin-like MnO2 on Carbon Cloth for Supercapacitors

Facile Synthesis of Ag-Doped Urchin-like MnO2 on Carbon Cloth for Supercapacitors

Unraveling the Effect of Electric Discharge Machining Current on the Fabrication of 3D Mo‐Doped VO_0.2 Integrated Microsupercapacitors

Carboxymethylcellulose Induced the Formation of Amorphous MnO₂ Nanosheets With Abundant Oxygen Vacancies for Fast Ion Diffusion in Aqueous Zinc‐Ion Batteries

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Optimizing the electrons/ions diffusion kinetics in δ-MnO2 for realizing an ultra-high rate-capability supercapacitor

Cited by 25 publications

References 76 publications

Facile Synthesis of Ag-Doped Urchin-like MnO2 on Carbon Cloth for Supercapacitors

Facile Synthesis of Ag-Doped Urchin-like MnO2 on Carbon Cloth for Supercapacitors

Unraveling the Effect of Electric Discharge Machining Current on the Fabrication of 3D Mo‐Doped VO0.2 Integrated Microsupercapacitors

Carboxymethylcellulose Induced the Formation of Amorphous MnO2 Nanosheets With Abundant Oxygen Vacancies for Fast Ion Diffusion in Aqueous Zinc‐Ion Batteries

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Product

Resources

About

Unraveling the Effect of Electric Discharge Machining Current on the Fabrication of 3D Mo‐Doped VO_0.2 Integrated Microsupercapacitors

Carboxymethylcellulose Induced the Formation of Amorphous MnO₂ Nanosheets With Abundant Oxygen Vacancies for Fast Ion Diffusion in Aqueous Zinc‐Ion Batteries